Daimler Trucks

Field Service Modification

North America LLC
April 2021
D21M1

Subject: DT12 Transmission Drive Shaft Cover Plug Reseal
Models Affected: DT12 Transmissions

General Information

Daimler Trucks North America LLC, on behalf of its DETROITTM Powertrain Division, is initiating Field Service
Campaign D21M1 on certain DT12 transmissions in order to reseal the bypass plugs of the drive shaft cover located
in front housing.
All affected units will require transmission removal in order to reseal the bypass plugs.
This is the only repair authorized under this campaign. Some oil loss from the plugs is expected. If oil loss is excessive
or location differs from the plugs called out in this document, additional repairs outside of this campaign will be
required. Please conduct those repairs in accordance to the published work instructions available online.
There are approximately 66 units affected by this field service campaign.

Work Instructions

Please refer to the attached work instructions. Prior to performing the recall campaign, check the vehicle for a
completion sticker (Form WAR261).

Replacement Parts

Replacement parts are now available by ordering the new part number(s) listed below from your facing Parts
Distribution Center.
Table 1 Replacement Parts for D21M1 (All 66 vehicles)
Campaign
Group

Part Number

Part Description

Quantity
Required

A

LOC 56707

PST 567 6ML TUBE

1

A

A 715 261 07 80

GASKET, INPUT SHAFT HOUSING

1

A

DDE N000908018011

SCREW PLUG (optional) – Temperature Control Valve

1

A

DDE N007603018101

SEAL RING – Temperature Control Valve

1

A

A 003 990 29 17

SCREW PLUG (optional) – Bypass Control Valve

1

A

DDE N007603027100

SEAL RING – Bypass Control Valve

1

A

N000908 042001

PLUG, OIL SCREEN M42x1.5 (optional) – Pressure
Control Valve

1

A

N007603 042100

SEAL RING, OIL SCREEN PLUG – Pressure Control
Valve

1

Daimler Trucks

Field Service Modification

North America LLC
April 2021
D21M1

Labor Allowance
Table 2 – Labor Allowance for D21M1
Procedure

Time Allowed
(hours)

SRT Number

Corrective Action

996-F026A

12-Repair
Recall/Campaign

D21M1
FRONT COVER, DT12, RESEAL
(D21M1)

7.3 – 8.2

Claim Reimbursement
You will be reimbursed for your parts, labor, and handling (landed cost for Export Distributors) by submitting your
claim through the Warranty system within 30 days of completing this campaign. Please reference the following
information in OWL:
Table 3 - Claim Reimbursement
Claim Type

Field Service Campaign

Campaign

D21M1

Component Code
Cause Code
Primary Failed Part

026-001-007
A1- Campaign
N000908 042001
Procedure A1

Use the following operation
Labor Number

1

996-F026A

Labor Hours

7.3 – 8.2
FRONT COVER, DT12, RESEAL (D21M1)

Part Number

Refer to Replacement Parts List above

Parts Return

NONE

Administrative time (SRT 939-6010A) for 0.3 hours is automatically added to the claim.

This Field Service Campaign will terminate on April 13, 2022. Dealers will be notified of any changes.
IMPORTANT: OWL must be viewed prior to beginning work to ensure the vehicle is involved and the campaign has
not previously been completed.
All claims must be submitted within 30 days of the repair and within 30 days of the termination date of the
campaign.
For questions, U.S. and Canadian dealers, contact the Warranty Campaigns Department via Web inquiry at
DTNAConnect.com / WSC. Export distributors submit a Web inquiry or contact your International Service Manager.

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Daimler Trucks

Field Service Modification

North America LLC
April 2021
D21M1

Detroit Diesel Corporation
13400 Outer Drive, West
Detroit, Michigan 48239-4001
Telephone: 313‐592‐5000

Copy of Notice to Owners
Subject: Field Service Campaign D21M1 DT12 Transmission Drive Shaft
Cover Plug Reseal
Daimler Trucks North America LLC, on behalf of its DETROITTM Powertrain Division, is initiating Field Service
Campaign D21M1 to reseal the bypass plugs of the Drive shaft Cover located in the front housing of the transmission.
All units will require the transmission removal in order to reseal the bypass plugs.
This is the only repair authorized under this campaign. Some oil loss from the plugs is expected.
Records available to us indicate that your vehicle has one of the affected assemblies. Instructions for this Field
Service Campaign have been sent to your local Freightliner Authorized Repair Facility and the labor time required
to perform this repair is 8.2 hours.
Please contact a Freightliner Authorized Repair Facility to arrange to have the Recall Campaign performed. To
locate an authorized facility, search online at https://demanddetroit.com/find-a-dealer/
This service will be completed for you at no charge, prior to April 13, 2022 under the provisions of this notice.
We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued
satisfaction with our products.
DETROIT WARRANTY CAMPAIGNS DEPARTMENT
Enclosure

Daimler Trucks

Field Service Modification

North America LLC
April 2021
D21M1

Work Instructions
Subject: DT12 Transmission Drive Shaft Cover Plug Reseal
Models Affected: DT12 Transmissions

Special Tools
Description

Part Number

Lift Assembly

DDE DSN012T18003

Transmission Stand Set

DDE DSN012T18002

Air Line Socket

DDE DSN012T18009

Front Housing Lift Handle

DDE DSN012T18005

Guide Stud

DDE DSN012T18010

Seal Protector Sleeve

DDE DSN012T18008

Corrective Procedure
1. Remove the transmission, Refer to "Removal of the Transmission" section in the Detroit Transmissions
Manual and follow all applicable steps and WARNINGS.

NOTICE
Depending on the manufacturer, clutch friction materials can contain asbestos.
Compressed gases, such as shop air, should never be used to disperse dust in the bell
or flywheel housings.

2. Lift the transmission off the transmission jack and set it vertically using the lift assembly (DDE
DSN012T18003) in the stand (DDE DSN012T18002), Refer to "Transmission Stand Set" section in the
Detroit Transmissions Manual.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

3. Remove the clutch position sensor pass-thru harness, and clutch actuator.

4. Remove the counter shaft brake air line connection, at the front cover (DDE DSN012T18009).
5. Remove the wire ties and swing the counter shaft brake air line out of the way.

6. Using two of the CPCA fasteners, install the front cover lift handle (DDE DSN012T18005), hand-tight.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

7. Install the seal protector sleeve (DDE DSN012T18008) on the splined section of the input shaft.

8. Remove the fasteners holding the front cover to the transmission case.

9. Evenly lift the cover from the housing, being careful not to drop the bearing races that may be caught in the
housing during removal.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

10. Confirm all the shims and bearings are reinstalled in the transmission.

11. Support the housing on a non-mar surface, and remove the pressure control valve cap and seal ring.

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Daimler Trucks

Field Service Modification

North America LLC
April 2021
D21M1

NOTICE
Do not allow the passages and valves in the housing to be exposed to solvents. If
cleaning with solvents apply them to a lint-free cloth and wipe down the threads in the
housing.
12. Clean the port and cap, and assemble the cap and seal ring.

13. Apply Loctite 567 (LOC 56707), high temperature thread sealant or equivalent, to the threads of the cap.
14. Install the cap and torque to 100 N·m (74 lb·ft).
15. Remove the temperature control valve cap (1).

1

16.
17.
18.
19.

Clean the port and cap, and assemble the cap and seal ring.
Apply Loctite 567, high temperature thread sealant or equivalent, to the threads of the cap.
Install the cap and torque to 60 N·m (44 lb·ft).
Remove the bypass control valve cap (2).

2

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Daimler Trucks
North America LLC
April 2021
D21M1
20.
21.
22.
23.

Field Service Modification

Clean the port and cap, and assemble the cap and seal ring.
Apply Loctite 567, high temperature thread sealant or equivalent, to the threads of the cap.
Install the cap and torque to 40 N·m (30 lb·ft).
Apply small amount of petroleum jelly to the front cover housing bearing bores, in the zones shown below,
to hold the shims in place.

NOTICE
If the shims fall out of the front cover they will get damaged in subsequent steps.
24. Install the shims into the front housing.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

WARNING
If the oil control rings are not centered, they can catch on the edge of the input shaft
and break during installation.
25. Apply a small amount of petroleum jelly to the oil control rings (1) in the cover, and center them in the
grooves.

26.
27.
28.
29.

Install the front housing seal (A 715 261 07 80).
Clean the fasteners and threads in the transmission case, for attaching the front cover housing.
Inspect the sealing surface, and clean to remove any residual oil, particles, and residue.
Install the guide stud (DDE DSN012T18010) in the top corner position of the front cover bolt pattern.

30. If not already done, install the Seal Protector Sleeve (DDE DSN012T18008) on the input shaft to protect
the seal from the clutch splines; see graphic below. To prevent damage to the seal and sleeve, do not allow
the sleeve to cover the seal area of the shaft.

31. Install the front cover housing.
1) Apply medium strength thread locker to the first fastener.
2) Position the front cover on the input shaft, and feed it onto the guide stud.
3) Turn the input shaft as you lower the cover into position, noting there are two alignment tasks
(countershaft brake drive & oil pump drive) required to seat the cover fully.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

NOTICE
Once the counter-shaft brake drive engaged, the brake release detent spring
will be pushing the cover away from the transmission housing. Keep pressure
on the front cover and install one bolt to maintain the position and alignment
of the components. Test the rotation of the transmission, by turning the input
shaft to confirm there is no binding.
32.
33.
34.
35.

Remove the guide stud.
Remove the seal protector sleeve.
Apply medium strength thread locker to the remaining fasteners.
Install the remaining bolts in a clockwise pattern, as shown in the figure below, and use the same pattern to
torque to 23 N·m (17 lb·ft).

36. Remove the front cover lift handle.
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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

37. Install the counter shaft brake line connection and torque to 10 N·m (7 lb·ft.).

NOTICE
When the front cover, the bearing races and shims are set correctly, the input shaft
should rotate without binding. The amount of torque required depends on the gear
position of the Range group, but the input shaft should turn smoothly.
38. Secure the counter-shaft brake air line to the clipping points (1).

39. Compress and install the clutch actuator, and torque to 55 N·m (40 lb·ft).

40. Install the clutch position sensor harness pass-thru.

41. Lift the transmission off the stand and set it horizontally in the transmission jack. Refer to "Transmission
Stand Set" section in the Detroit Transmissions Manual.
42. Install the transmission. Refer to "Installation of the Transmission" section in the Detroit Transmissions
Manual.
43. Repairs are complete.

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Daimler Trucks
North America LLC
April 2021
D21M1

Field Service Modification

Completion Stickers
•

Upon completion of Field Service Campaign D21M1, clean a spot on the base label (Form WAR259), write
the Field Service Campaign Number D21M1 on a blank, completion sticker (Form WAR261), and attach
the completion sticker to the base label.
Label ordering info: DTNAConnect > Services and Reference > Publications & Warranty Supplies >
Warranty

Page 13